BMW R1100 Spezifikationen PDF herunterladen (Seite 60)

FR6DDC, a slightly hotter running tip. Some have reported the newer Bosch

plug is an improvement, but many other riders I have communicated with say the

Autolite or Champion plug is, in most cases, quite superior in operation and

surging minimization.

What’s my favorite? Autolite. They exhibit minimal wear during the 12,000 mile

specified service life and the center electrode color (on my RS) is a perfect

medium to light tan on the insulator. My experience with Champions (in K-bikes)

is satisfactory--quite good actually--but the Autolites seem to win out in life

expectancy, electrode wear, and have a performance edge that I “think” I can

feel. Perhaps this is just a prejudice, though.

Some riders have reported that the non-OEM Autolites or Champions are 1/8”

longer than the original Bosch plugs. I don’t find this to be the case with the

Autolites. The measured length from the crushed gasket to the tip of the

electrode is 22.5mm on the original 3-electrode FR5DTC and 23mm on the

Autolite 3923. Perhaps the length of the FR6DDC is slightly shorter and/or the

Champion RC9YC is slightly longer equating to the reported difference. I

haven’t measured the Champion, but in any case there have been no reported

interference problems and all of these plugs are 14mm, ¾” reach and take a 5/8”

socket. Use a 12 point thinwall socket to clear the small cylinder head access

hole.

So here are your options, gapped at .031” or .8mm:

OEM:

Bosch FR5DTC (3-electrode)

Bosch FR6DDC (2-electrode)

Non-EOM:

Autolite 3923 (1-electrode)

Champion RC9YC or RC9YC4 (1-electrode)

(Note: If you are hard-core Bosch, their 1-electrode Autolite 3923 equivalent is

the F6DC)

One VERY good thing about these non-OEM plugs is their availability and price.

For example, you can purchase the Autolites at a store such as Auto Zone or

Checker for about $1.20 each and then get a $.50 rebate each on top of that.

What a deal for better performance!

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BMW R1100 Spezifikationen Seite 60